Lara's boob bungle: Bingle grapples with her bikini and nearly exposes her modesty as she hits the surf with Sam Worthington

Only a few days before she appeared to be avoiding tan lines as she sunbathed nude underneath the Hawaiian sun.

But on Thursday, Lara Bingle had done an about turn as she frolicked in the sea with her Avatar beau - this time fighting the elements to keep her bikini top on.

The bombshell was seen battling against the sea whilst holding onto her bikini to preserve her modesty.

A handful! Lara Bingle cupped her right breast in an attempt to protect herself from a bikini-malfunction as Sam Worthington swam behind her

Beauty: The blonde model appeared to be having particular trouble with the right side of her bikini top and used both hands to secure it back into place

Wading against the tide, the 27-year-old, on holiday in Hawaii with boyfriend Sam Worthington, 38, went for a plunge in the blue waters when the force nearly caused her lead-coloured two-piece to go astray.

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Laughing skywards, the Sydney-born star was only too aware that she was struggling to preserve her modesty in the swell.

Bobbing in the sea, the pair appeared relaxed while lapping up Hawaii - home to some of the best rips, sunshine and cocktails.

You can't stop the waves! With her eyes closed she used one hand to hold her chest and the other to try and stop the wave from hitting her

Bingle boob bungle: Lara nearly lost her bikini when she hit the surf in Hawaii

Earlier in the day, the pair were seen kissing and cudding on the warm sand before Sam lead his squeeze towards the beckoning sea.

Once knee-deep, they plunged in with Lara seen holding onto her chest and fixing up her two-piece.

In no time the sopping pair were back on dry land laughing at their unexpected adventure.

Bathing and bonding: Boyfriend Sam joined Lara for a quick dip

Had enough! The Australian babe soon got tired of hanging onto her bikini in the waves and headed back to the sand

Earlier in the week, Lara had willingly exposed her ample chest when she stripped off for all all-body tan in secluded spot.

Whether it was the sun that was making her glow, or her very own brand of bronzing and tanning products, The Base, the beauty looked radiant against the backdrop of the ocean.

Sam has managed a break from filming Deadline Gallipoli to join his girlfriend for the romantic trip.

Holding hands: Sam tried to keep Lara in the water by grabbing her hand

Wave casualty: She might be used to the surf but Lara still managed to get the salt water up her nose!

Eager: earlier on Lara was keen to get into the sea before she realised how difficult it was to keep her bikini top on in the waves

Come on! Lara pulled herself off the sand to take a dip with Sam

The actor will soon also be returning to the role of Jake Sully in the sequel to Avatar.

Fox Studios gave the go ahead for three sequels to be shot simultaneously and released on 2016, 2017 and 2018.

James Cameron's environmentally-minded blockbusters are estimated to have a combined budget of $1 billion.

Shirtless: The Avatar star reappeared from the waves and wiped the sea water off his face

Sam hasn't had many stand out roles in his films of the last year but he'll soon be taking a high-profile turn in the 3D adventurer thriller Everest opposite Jake Gyllenhaal, Keira Knightley and Josh Brolin.

The film is based upon the events of the 1996 Mount Everest disaster, in which several climbers died.

No doubt Lara had been using her own brand of bronzing and tanning products, The Base, to keep her skin glowing.

Hungry work: Lara tucked into a packed lunch after their swim

Deserted: The couple looked as though they had the beach to themselves

Drying off: Just like any other couple Lara and Sam shared the same towel to dry themselves off

Tender: The enjoyed a loving moment together before hitting the sea

Sam and Lara are quite the notorious pair, as they both have been in trouble with the law in the last few years.

Lara is currently serving a six-month suspended jail sentence for driving in October and November 2013, without a licence.

The Aussie model was also fined $2000 and banned from driving for two years.

Stunner: She looked gorgeous in an understated bikini

Breezy: They were given a reprieve from the heat with some nice gusts of wind

Squinting: Despite wearing a baseball hat the Lara still couldn't see properly in the bright sunshine as she giggled with her beau

Big stretch: The inseparable pair are always looking at each other adoringly

In February this year, Sam was arrested after getting into a punch up with a photographer, Sheng Li, who reportedly kicked his girlfriend in the shin.

The actor avoided jail time after a court in the Unites States dropped assault charges laid against him when he entered into a conditional dismissal deal on April 8th.

Holiday fun: Sam has managed a break from filming Deadline Gallipoli to join his girlfriend for the romantic trip